Relative timing jitter in a counterpropagating all-normal dispersion dual-comb fiber laser
Relative timing jitter in a counterpropagating all-normal dispersion dual-comb fiber laser
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DOI：
10.1364/optica.458339
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发表时间：
2022-07-20
期刊：
影响因子：
10.4
通讯作者：
Li, Bowen
中科院分区：
文献类型：
--
作者：
Prakash, Neeraj;Huang, Shu-Wei;Li, Bowen
反向传播全正常色散光纤激光器是一种新兴的单腔双梳状结构的高能量激光光源。其相对定时抖动（RTJ），双梳定时精度和光谱分辨率的关键参数，还没有得到全面的研究。在本文中，我们提高了国家的最先进的CANDi光纤激光器的脉冲能量从1 nJ到8 nJ。然后，我们介绍了一种无参考RTJ表征技术，提供了一个镜头到镜头的测量能力，在飞秒精度。测量本底噪声达到1.6 × 10（-7）fs（2）/Hz，相应的积分测量精度仅为1.8 fs（1 kHz，20 MHz）。有了这个表征工具，我们能够详细研究CANDi激光器的RTJ的物理起源。我们首先验证了腔长起伏对RTJ没有贡献。然后，我们测量了积分RTJ为39 fs（1 kHz，20 MHz），并确定了泵浦相对强度噪声（RIN）是导致积分RTJ的主要因素，特别是泵浦RIN通过Gordon-Haus效应耦合到RTJ。最后讨论了减小自由运转CANDi激光器RTJ的方法。这项工作提供了一个一般的指导方针，以提高紧凑的单腔双梳系统，如CANDi激光器的性能，有利于各种双梳的应用。(c)2022 Optica出版集团根据Optica开放获取出版协议的条款
The counterpropagating all-normal dispersion (CANDi) fiber laser is an emerging high-energy single-cavity dual-comb laser source. Its relative timing jitter (RTJ), a critical parameter for dual-comb timing precision and spectral resolution, has not been comprehensively investigated. In this paper, we enhance the state-of-the-art CANDi fiber laser pulse energy from 1 nJ to 8 nJ. We then introduce a reference-free RTJ characterization technique that provides shot-to-shot measurement capability at femtosecond precision. The measurement noise floor reaches 1.6 x 10(-7) fs(2)/Hz, and the corresponding integrated measurement precision is only 1.8 fs (1 kHz, 20 MHz). With this characterization tool, we are able to study the physical origin of the CANDi laser's RTJ in detail. We first verify that the cavity length fluctuation does not contribute to the RTJ. Then we measure the integrated RTJ to be 39 fs (1 kHz, 20 MHz) and identify the pump relative intensity noise (RIN) to be the dominant factor responsible for it. In particular, pump RIN is coupled to the RTJ through the Gordon-Haus effect. Finally, solutions to reduce the free-running CANDi laser's RTJ are discussed. This work provides a general guideline to improve the performance of compact single-cavity dual-comb systems such as the CANDi laser, benefitting various dual-comb applications. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement